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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Sometimes your systolic and diastolic numbers may put you in 2 different categories. For example, your systolic number could be 145 (Stage 1 high blood pressure). Your diastolic number, however, could be 100 (Stage 2 high blood pressure).